Answer:
Answer 4
Explanation:
The slope is 7.8-4.8/12-7 = 3/5 = 0.6
So choose between 3 & 4
Plug in one of the points in 3:
7.8=0.6*12+1.8
7.8=7.2+1.8
7.8=9 wrong
Plug in 4:
7.8=0.6*12+0.6
7.8=7.2+0.6
7.8=7.8 correct
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